I'm so used to seeing TV shows with the "bachelor" who constantly sleeps around and never has a partner, or the one who's looking for "the one" and falls in love and looses someone new every five episodes. And at school, I'm used to everyone dating for a week, then more or less switching partners, or randomly sleeping together.

My question is: How many partners do most people have in their life time? And do one-week stands count as a small relationship? How short can a relationship be, and how long can it before moving on and finding someone new becomes really hard? Can people be in committed, loving, polygamous relationships, or have different partners for different things (like someone else for especially rough sex you wouldn't want to subject a gentler emotional-lover to)?